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A conducting sphere of radius R and a co...

A conducting sphere of radius R and a concentric thick spherical shell of inner radius 2R and outer radius 3R is shown in figure. A charge `+10Q` is given to the shell and inner sphere is earthed. Then charge on inner sphere is

A

`-4Q`

B

`-100Q`

C

zero

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
A
a, Potential of sphere should be zero.
`V=(kq)/(R)-(kq)/(2R)+(k(10Q+q))/(3R)=0`
or `q=-4Q`
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